From b668022f9b8aecf52109c9e0b7e5847054231361 Mon Sep 17 00:00:00 2001
From: Zdenek Kabelac <zkabelac@redhat.com>
Date: Fri, 19 Aug 2022 16:15:17 +0200
Subject: [PATCH] mm: preallocate memory only with glibc

Use mallinfo() only with glibc.

Backported from: https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=8370d117d7ef8a472c95315a3cd085696c90b3be
Signed-off-by: Simon Rowe <simon.rowe@nutanix.com>
---
 lib/mm/memlock.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/mm/memlock.c b/lib/mm/memlock.c
index 3d1a3927c..efcc6d91f 100644
--- a/lib/mm/memlock.c
+++ b/lib/mm/memlock.c
@@ -160,7 +160,12 @@ static void _touch_memory(void *mem, size_t size)
 
 static void _allocate_memory(void)
 {
-#ifndef VALGRIND_POOL
+#if defined(__GLIBC__) && !defined(VALGRIND_POOL)
+	/* Memory allocation is currently only tested with glibc
+	 * for different C libraries, some other mechanisms might be needed
+	 * meanwhile let users use lvm2 code without memory preallocation.
+	 * Compilation for VALGRIND tracing also goes without preallocation.
+	 */
 	void *stack_mem;
 	struct rlimit limit;
 	int i, area = 0, missing = _size_malloc_tmp, max_areas = 32, hblks;
-- 
2.22.3

